/*
Copyright 2024 Huawei Cloud Computing Technologies Co., Ltd.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

 http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package index

import (
	"fmt"
	"strings"
)

type IndexType int

const (
	MergeSet IndexType = iota
	Text
	Field
	TimeCluster
	BloomFilter
	BloomFilterFullText
	MinMax
	Set
	IndexTypeAll
)

const (
	MergeSetIndex            = "mergeset"
	TextIndex                = "text"
	FieldIndex               = "field"
	TimeClusterIndex         = "timecluster"
	BloomFilterIndex         = "bloomfilter"
	BloomFilterFullTextIndex = "bloomfilter_fulltext"
	MinMaxIndex              = "minmax"
	SetIndex                 = "set"
)

var (
	IndexNameToType = map[string]IndexType{
		MergeSetIndex:            MergeSet,
		TextIndex:                Text,
		FieldIndex:               Field,
		TimeClusterIndex:         TimeCluster,
		BloomFilterIndex:         BloomFilter,
		BloomFilterFullTextIndex: BloomFilterFullText,
		MinMaxIndex:              MinMax,
		SetIndex:                 Set,
	}
	IndexTypeToName = map[IndexType]string{
		MergeSet:            MergeSetIndex,
		Text:                TextIndex,
		Field:               FieldIndex,
		TimeCluster:         TimeClusterIndex,
		BloomFilter:         BloomFilterIndex,
		BloomFilterFullText: BloomFilterFullTextIndex,
		MinMax:              MinMaxIndex,
		Set:                 SetIndex,
	}
)

func GetIndexTypeByName(name string) (IndexType, error) {
	index, ok := IndexNameToType[strings.ToLower(name)]
	if !ok {
		return MergeSet, fmt.Errorf("invalid index name %s", name)
	}
	return index, nil
}

func GetIndexNameByType(id IndexType) (string, error) {
	name, ok := IndexTypeToName[id]
	if !ok {
		return "", fmt.Errorf("invalid index type %d", id)
	}
	return name, nil
}
